Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10e09ca284856c3…

MALICIOUS

PDF

66.6 KB Created: 2021-01-06 15:04:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f439fa930fe2e6229a1449c97c46f464 SHA-1: c429a364d61914b91b55c86797c1982b7626a84a SHA-256: b10e09ca284856c338aeaac8392b8dd44a1ab6ff2f00d36effcc551aa40d1cb9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://gettraff.ru/123?utm_term=ascending+and+descending+order+worksheets+for+grade+1'. This indicates the document's primary purpose is to lure the user to this malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/123?utm_term=ascending+and+descending+order+worksheets+for+grade+1 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4402737/normal_5ff268482ba1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382430/normal_5fc8d12760660.pdfIn PDF document text
    • https://cdn.sqhk.co/tikisudolo/agg0gfk/kutalaruwat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368230/normal_5f9f915740d7c.pdfIn PDF document text
    • https://cdn.sqhk.co/dejenuluzew/X3K7Uig/77640515353.pdfIn PDF document text
    • https://cdn.sqhk.co/wetilusogaki/ghjgjdp/nitolonorisal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376087/normal_5f9c4cba12291.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/afdcefb4-9081-449e-93b5-ed4703cbcecf/tumefutakasefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b6452b-9251-4c6f-8134-f9bcf48fa9ad/cub_scout_dues_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57164c6b-fee4-40a0-a479-c37552eea49b/tetubam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/572533df-2b8a-4137-ae7c-0f241df51540/nfl_network_spectrum_nyc.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC878 5448 bytes
SHA-256: e8217a6909883ab1b518c523b91a6108d799921fb365a367783de39b7745befb
font_01_sfnt_off0000db17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB17 10120 bytes
SHA-256: 9f6cbcfe8ccb8160d9fff725cbea59afb1316da75c3639027ab20257b48d256b

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